一种基于Lorenz混沌系统的比特级彩色图像加密算法

Bit-Level Color Digital Image Encryption Algorithm Based on Lorenz Chaotic System

摘要: 定本文提出了一种基于Lorenz混沌系统的比特级彩色数字图像加密算法，针对彩色数字图像的三个分量R、B、G，用Lorenz混沌系统产生的x、y、z三个维度的混沌序列分别进行加密，最后再合而为一。加密时，把每一个十进制的像素值看成是八位二进制数，利用混沌序列的升序排列位置索引进行置乱，达到像素融合的目的，实现图像的加密。加解密数值实验和算法的有效性安全性分析，说明该算法安全有效，具有较高的抗攻击能力。

Abstract: In this paper, we present a bit-level color digital image encryption algorithm based on Lorenz chaotic system. Firstly the red, green and blue components of each pixel are encrypted by the x, y, z three dimensional chaotic sequences generated by the Lorenz Chaotic System, respectively, and then they are merged into the whole. In the process of encryption, each decimal pixel value is treated as an eight bit binary number and is permuted by the ascending order position index chaotic sequence so as to achieve the purpose of pixel fusion and image encryption. The experi-mental results and security analysis show that the algorithm is a good encryption with better effects and can ensure adequate safety of the color image.